Diagram Class

Represents the base class for classes that provide diagrams functionality for a chart control.

Namespace: DevExpress.Xpf.Charts

Assembly: DevExpress.Xpf.Charts.v21.2.dll

Declaration

public abstract class Diagram :
    ChartElement,
    IDiagram,
    IChartDiagram,
    IInteractiveElement,
    IVisualChildOwner,
    ISeriesTemplateContainer

The following members accept/return Diagram objects:

Remarks

Each group of similar series types demands its own associated diagram type.

The Diagram class serves as a base for classes which provide common functionality for different diagram types available for a chart control. The Diagram class implements the base diagram functionality that is common to all diagram types, and possesses a collection of Diagram.Series that will represent this diagram.

Note that a single diagram type can only correspond to a single chart control instance.

For more information, refer to Diagram and Series Type Compatibility.

Example

This example shows how to create a 2D Side-by-Side Bar chart.

  1. Create a ChartControl and set its ChartControl.Diagram property to a XYDiagram2D object. Note that the ChartControl.Diagram is a content property. You can declare a diagram in XAML directly after a chart control’s declaration without wrapping it in opening and closing ChartControl.Diagram tags.

  2. Specify the Diagram.SeriesItemsSource property to bind a collection of objects used to generate series.

    The Diagram.SeriesItemTemplate property allows you to define a template for all series. Use the following API members to configure a series item:

    Member Description
    BarSideBySideSeries2D Represents the 2D Side-by-Side Bar series.
    Series.DataSource Specifies the series’s data source.
    Series.ArgumentDataMember Defines the data member that provides the series’s arguments.
    Series.ValueDataMember Specifies the data member that provides the series’s values.
    Series.DisplayName Gets or sets the display name of the series.

    For more information on how to populate a chart with data, see the following section: Providing Data

  3. Use the following API members to configure the x-axis options.

    Member Description
    XYDiagram2D.AxisX Gets the X-axis.
    AxisX2D Represents the X-axis of a XYDiagram2D class.
    AxisX2D.DateTimeScaleOptions Provides access to the options that define the behavior of a date-time X-scale when its mode is manual, automatic or continuous.
  4. Create a legend and customize its settings. For more information about legends, refer to the following topic: Legends

View Example

<Window x:Class="SideBySideBar2DChart.Window1" 
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts"
        xmlns:local="clr-namespace:SideBySideBar2DChart"
        Title="Window1" Height="350" Width="620">
    <Window.DataContext>
        <local:ChartViewModel/>
    </Window.DataContext>
    <Grid>
        <dxc:ChartControl Name="chartControl1">
            <dxc:ChartControl.Diagram>
                <dxc:XYDiagram2D SeriesItemsSource="{Binding Data}">
                    <dxc:XYDiagram2D.SeriesItemTemplate>
                        <DataTemplate>
                            <dxc:BarSideBySideSeries2D DisplayName="{Binding Name}" 
                                               DataSource="{Binding Values}"
                                               ArgumentDataMember="Argument"
                                               ValueDataMember="Value" 
                                               BarWidth="0.6">
                                <dxc:BarSideBySideSeries2D.Model>
                                    <dxc:BorderlessSimpleBar2DModel/>
                                </dxc:BarSideBySideSeries2D.Model>
                            </dxc:BarSideBySideSeries2D>
                        </DataTemplate>
                    </dxc:XYDiagram2D.SeriesItemTemplate>
                    <dxc:XYDiagram2D.AxisX>
                        <dxc:AxisX2D>
                            <dxc:AxisX2D.DateTimeScaleOptions>
                                <dxc:ManualDateTimeScaleOptions MeasureUnit="Year" GridAlignment="Year" 
                                                                AutoGrid="False" GridSpacing="1"/>
                            </dxc:AxisX2D.DateTimeScaleOptions>
                        </dxc:AxisX2D>
                    </dxc:XYDiagram2D.AxisX>
                </dxc:XYDiagram2D>
            </dxc:ChartControl.Diagram>
            <dxc:ChartControl.Legends>
                <dxc:Legend HorizontalPosition="Right"/>
            </dxc:ChartControl.Legends>
        </dxc:ChartControl>
    </Grid>
</Window>
using System;
using System.Collections.ObjectModel;
using System.Windows;
namespace SideBySideBar2DChart {
    public partial class Window1 : Window {
        public Window1() {
            InitializeComponent();
        }
    }
    public class ChartViewModel {
        public ObservableCollection<DataSeries> Data { get; private set; }

        public ChartViewModel() {
            Data = new ObservableCollection<DataSeries> {
                new DataSeries{
                    Name = "DevAV North",
                    Values = new ObservableCollection<DataPoint> {
                        new DataPoint (new DateTime(2013,12,31), 362.5),
                        new DataPoint (new DateTime(2014,12,31), 348.4),
                        new DataPoint (new DateTime(2015,12,31), 279.0),
                        new DataPoint (new DateTime(2016,12,31), 230.9),
                        new DataPoint (new DateTime(2017,12,31), 203.5),
                        new DataPoint (new DateTime(2018,12,31), 197.1)
                    }
                },
                new DataSeries{
                    Name = "DevAV South",
                    Values = new ObservableCollection<DataPoint> {
                        new DataPoint (new DateTime(2013,12,31), 277.0),
                        new DataPoint (new DateTime(2014,12,31), 328.5),
                        new DataPoint (new DateTime(2015,12,31), 297.0),
                        new DataPoint (new DateTime(2016,12,31), 255.3),
                        new DataPoint (new DateTime(2017,12,31), 173.5),
                        new DataPoint (new DateTime(2018,12,31), 131.8)
                    }
                }
            };
        }
        public class DataSeries {
            public string Name { get; set; }
            public ObservableCollection<DataPoint> Values { get; set; }
        }
        public class DataPoint {
            public DateTime Argument { get; set; }
            public double Value { get; set; }
            public DataPoint(DateTime argument, double value) {
                Argument = argument;
                Value = value;
            }
        }
    }
}
See Also